Rebuilt the collection onto the 64GB drive and as expected, too many files for track voice commands.

I have a 32GB drive and loaded about 28GB of music onto it, more or less what I would usually listen to and it works great. I didn't mess with the tag data at all, which makes me think it's a straight file count limitation.

1 other thing that seems odd -
There's no way to select different sources from the steering wheel controls. The manual shows a different setup with a media button. Mine has OK in the middle with arrows around it. Am I missing something, or did they just leave it out?

Whenever I want to browse the media stuff I have to hit the MENU button on the center console I think it is, next to the music symbol button, and then I use the steering wheel arrows.